城镇雨水管渠设计重现期取值方法探讨

以江苏省仪征市雨水排水系统可行性研究为例，通过对同一雨水排水系统雨水设计重现期的不同取值对雨水排水管渠建设费用影响的分析，提出城镇雨水设计重现期的选取应把城镇功能区划作为划分各汇水区域的重要参数，因地制宜地对不同汇水区域选用不同的设计重现期值，使雨水管网在满足排水需要的同时又符合经济性的要求，最后，对规范的完善提出了建议。

Determination of design return period for urban storm-drainage systems

With the feasibility study of the storm-drainage system in Yizhen City of Jiangsu Province as an example, the influences of design return period on the construction cost of the storm-drainage system are analyzed. It is pointed out that the determination of the design return period should be done for each catchment according to function regionalization, so that the storm-drainage system can meet the requirement of drainage and economy. Finally, some suggestions are proposed for improvement of standards for design rainfall return period.